<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>

<body>
    <script>
        setInterval(function() {
            console.log(1111);
        }, 1000);

        function fn() {
            setTimeout(function() {
                console.log(111);
                fn();
            }, 1000);
        }
        fn();
    </script>
</body>

</html>